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How to ensure the information security in the network is a research hotspot. Based on the CAM model, this paper presents a model with active memory supporting network security- AISMN and discusses AISMN model based on network system framework structure. The paper also discusses about using multi-agent structure to realize AISMN model based on the network system information security mechanism. Some key problem about AISMN model in certificate authorization, access control, digital signature and network system communication security are discussed. Compared with PKI, the network security framework structure based on this model can not only solve network system certificate authentication, access control, digital signature and data encrypt etc. problems, but also have the characters of being active, flexible, expandable, and supporting cooperative work etc. Finally, the paper discusses the application of this model with an example and then analyzes the performance.